The structural principle of single cylinder hydraulic cone crusher and the solution to the cause of runaway

The single-cylinder hydraulic cone crusher is a high-efficiency hydraulic single-cylinder cone crusher developed by Xingaonai by introducing foreign technology and combining many years of experience in the crushing industry with optimized design. Through the special design structure of the bottom single cylinder, it completes the three important functions of direct adjustment of the discharge port, prevention of iron, and cavity cleaning. It is suitable for medium and fine crushing of medium-hard materials such as river pebbles, granite, basalt, iron ore, limestone, diabase, etc. It has the advantages of simple and reliable structure, low failure rate, low production cost, strong operation stability, and convenient maintenance. It is widely used in metallurgy, construction, hydropower, transportation, building materials and other industrial fields, and occupies an important share in the market.

structure:

The single-cylinder cone crusher is mainly composed of many parts such as the lower frame, upper frame, feeding funnel, liner, center sleeve, eccentric sleeve, large bevel gear, chassis, thrust disc, moving cone, main shaft, liner, cylinder, piston, thrust disc group, beam, bushing, etc. The single-cylinder cone crusher has a hydraulic cylinder as a safety device, which makes the ore crushing process smarter and safer.

principle:

The working principle of the single-cylinder hydraulic cone crusher is to squeeze the ore through the crushing wall and the grinding wall. The motor drives the transmission shaft and the main shaft to make the movable cone part rotate and swing, thereby generating a periodic relative motion between the eccentrically swinging movable cone liner and the fixed cone liner, so that the material to be crushed is continuously squeezed and bent in the crushing chamber and crushed.

Due to the harsh working environment and long-term high-load operation, various faults may occur, among which the most common one is the "flying car" fault. When the moving cone of the cone crusher suddenly loses balance, the speed rises sharply, causing the machine body to vibrate violently, the insurance mechanism fails, the working current increases sharply, and the temperature rises rapidly, this phenomenon is called "flying car". If not handled in time, it may cause a series of serious problems, such as main motor burning, gear damage, main shaft breakage, etc.

Reasons for flying:

1. Most bowl-shaped bearings become thinner due to excessive wear, which directly increases the contact area between the two, and eventually causes the main body of the moving cone to sink, thereby reducing the gap between the copper sleeve and the main shaft, affecting the lubrication of the contact surface between the copper sleeve and the main shaft, so that the lubricating oil film cannot be formed or the thickness of the formed oil film is not enough, causing the equipment to run away.

2. The installer did not strictly follow the standard technical requirements, resulting in the inner wall quality not meeting the requirements, causing the cone sleeve to contact the main shaft, the oil film is easily destroyed, and the main shaft speed is out of control, resulting in equipment running away.

3. Due to the entry of non-crushed objects, they interact with the cone sleeve, causing the load of the machine body to be too large, resulting in the sliding of the cone sleeve's fixed objects and the movement of the cone sleeve, causing the gap between the main shaft and the cone sleeve to become smaller, resulting in the phenomenon of shaft holding, and the main shaft will follow the eccentric sleeve to run quickly and cause running away.

4. The crusher generates a lot of heat during the operation of the equipment, and the heat cannot be released through the heat exchanger, breaking the thermal balance of the system. The heat generated by the work is far greater than the working capacity of the cooler, which causes burning of the sliding contact parts such as the frame bushing, bowl-shaped tile, cone sleeve and shaft sleeve, resulting in adhesion between the cone sleeve and the main shaft and a runaway failure.

5. If the quality and quantity of the lubricating oil cannot meet the needs, the contact surface of the components cannot form a good and strong oil film, which will cause wear of the bearing and the moving cone, and serious burns will occur, which will cause the cone crusher to runaway failure for a long time.

6. After long-term operation, the thrust plate of the equipment is worn, the gap between the gears is limited, and the outer surfaces of the disc and eccentric shaft will also have serious wear, which will affect the meshing clearance between the large and small gears. It is easy to produce tooth knocking in production and cause runaway.

Solution:

In general, there are two main reasons for "flying car": one is that the gap between the main shaft and the cone sleeve is too small or the ball bearing is not scraped properly due to maintenance and adjustment; the other is improper operation and maintenance, and the lubricant is unqualified or ineffective. It can be solved from the following aspects:

1. Lubricants should be added in strict accordance with professional standards to ensure that the various indicators of lubricants meet the national regulations. When adding lubricants in winter, the lubricants should be heated in advance to ensure its fluidity.

2. When installing water seal dustproof devices, the staff should pay attention to the inspection of the retaining rings and rings. If they are damaged, they should be replaced in time.

3. Reasonably adjust the gap between the cone sleeve and the eccentric sleeve to avoid local overheating due to excessive gap.

4. Feed evenly to ensure that the feed is not too large.

From August 25th to October 6th, Xin Gaonai will hold a large-scale promotion with the lowest price of the year.